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Bacteria grow at a rate proportional to their number and double in 3 hours. When will they be 8 times?
A9 hours
B6 hours
C12 hours
D24 hours
Answer & Solution
Correct answer: A. 9 hours
Since P = P0 e^(kt) and doubling takes 3 hours, 8 times is 2³ so 3 x 3 = 9 hours.
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